Exchange of notes between the government of the United Kingdom of Great Britain and Northern Ireland and the government of Sierra Leone concerning officers designated by the government of the United Kingdom in the service of specified organisations or institutions in Sierra Leone [electronic resource] : (the British Expatriates Supplementation (Sierra Leone) Agreement 1971), Freetown, 20/29 March 1971 (the agreement entered into force on 1 April 1971) / presented to Parliament by the Secretary of State for Foreign and Commonwealth Affairs by command of Her Majesty, August 1973.